[PATCH 02/19] PCMCIA: soc_common: add GPIO support for card status signals
Russell King - ARM Linux
linux at arm.linux.org.uk
Fri Jan 20 05:17:49 EST 2012
Add GPIO support for reading the card status (card detect, ready,
battery voltage detect) signals into soc_common code. As we want
interrupts from these GPIOs, this takes over the old irq handling
infrastructure for card status signals, which will now be managed
entirely by the soc_common code.
Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
---
drivers/pcmcia/soc_common.c | 120 +++++++++++++++++++++++++++++++++++++++++-
drivers/pcmcia/soc_common.h | 10 ++++
2 files changed, 127 insertions(+), 3 deletions(-)
diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
index 84d90d5..09a9a52 100644
--- a/drivers/pcmcia/soc_common.c
+++ b/drivers/pcmcia/soc_common.c
@@ -32,6 +32,7 @@
#include <linux/cpufreq.h>
+#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
@@ -49,6 +50,8 @@
#include "soc_common.h"
+static irqreturn_t soc_common_pcmcia_interrupt(int irq, void *dev);
+
#ifdef CONFIG_PCMCIA_DEBUG
static int pc_debug;
@@ -104,6 +107,93 @@ void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *skt,
}
EXPORT_SYMBOL(soc_common_pcmcia_get_timing);
+static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
+ unsigned int nr)
+{
+ unsigned int i;
+
+ for (i = 0; i < nr; i++) {
+ if (skt->stat[i].irq)
+ free_irq(skt->stat[i].irq, skt);
+ if (gpio_is_valid(skt->stat[i].gpio))
+ gpio_free(skt->stat[i].gpio);
+ }
+
+ if (skt->ops->hw_shutdown)
+ skt->ops->hw_shutdown(skt);
+}
+
+static void soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+ __soc_pcmcia_hw_shutdown(skt, ARRAY_SIZE(skt->stat));
+}
+
+static int soc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+ int ret = 0, i;
+
+ if (skt->ops->hw_init) {
+ ret = skt->ops->hw_init(skt);
+ if (ret)
+ return ret;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
+ if (gpio_is_valid(skt->stat[i].gpio)) {
+ int irq;
+
+ ret = gpio_request_one(skt->stat[i].gpio, GPIOF_IN,
+ skt->stat[i].name);
+ if (ret) {
+ __soc_pcmcia_hw_shutdown(skt, i);
+ return ret;
+ }
+
+ irq = gpio_to_irq(skt->stat[i].gpio);
+
+ if (i == SOC_STAT_RDY)
+ skt->socket.pci_irq = irq;
+ else
+ skt->stat[i].irq = irq;
+ }
+
+ if (skt->stat[i].irq) {
+ ret = request_irq(skt->stat[i].irq,
+ soc_common_pcmcia_interrupt,
+ IRQF_TRIGGER_NONE,
+ skt->stat[i].name, skt);
+ if (ret) {
+ if (gpio_is_valid(skt->stat[i].gpio))
+ gpio_free(skt->stat[i].gpio);
+ __soc_pcmcia_hw_shutdown(skt, i);
+ return ret;
+ }
+ }
+ }
+
+ return ret;
+}
+
+static void soc_pcmcia_hw_enable(struct soc_pcmcia_socket *skt)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+ if (skt->stat[i].irq) {
+ irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_RISING);
+ irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_BOTH);
+ }
+}
+
+static void soc_pcmcia_hw_disable(struct soc_pcmcia_socket *skt)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+ if (skt->stat[i].irq)
+ irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_NONE);
+}
+
static unsigned int soc_common_pcmcia_skt_state(struct soc_pcmcia_socket *skt)
{
struct pcmcia_state state;
@@ -111,6 +201,22 @@ static unsigned int soc_common_pcmcia_skt_state(struct soc_pcmcia_socket *skt)
memset(&state, 0, sizeof(struct pcmcia_state));
+ /* Make battery voltage state report 'good' */
+ state.bvd1 = 1;
+ state.bvd2 = 1;
+
+ /* CD is active low by default */
+ if (gpio_is_valid(skt->stat[SOC_STAT_CD].gpio))
+ state.detect = !gpio_get_value(skt->stat[SOC_STAT_CD].gpio);
+
+ /* RDY and BVD are active high by default */
+ if (gpio_is_valid(skt->stat[SOC_STAT_RDY].gpio))
+ state.ready = !!gpio_get_value(skt->stat[SOC_STAT_RDY].gpio);
+ if (gpio_is_valid(skt->stat[SOC_STAT_BVD1].gpio))
+ state.bvd1 = !!gpio_get_value(skt->stat[SOC_STAT_BVD1].gpio);
+ if (gpio_is_valid(skt->stat[SOC_STAT_BVD2].gpio))
+ state.bvd2 = !!gpio_get_value(skt->stat[SOC_STAT_BVD2].gpio);
+
skt->ops->socket_state(skt, &state);
stat = state.detect ? SS_DETECT : 0;
@@ -188,6 +294,7 @@ static int soc_common_pcmcia_sock_init(struct pcmcia_socket *sock)
debug(skt, 2, "initializing socket\n");
if (skt->ops->socket_init)
skt->ops->socket_init(skt);
+ soc_pcmcia_hw_enable(skt);
return 0;
}
@@ -207,6 +314,7 @@ static int soc_common_pcmcia_suspend(struct pcmcia_socket *sock)
debug(skt, 2, "suspending socket\n");
+ soc_pcmcia_hw_disable(skt);
if (skt->ops->socket_suspend)
skt->ops->socket_suspend(skt);
@@ -638,10 +746,15 @@ module_exit(soc_pcmcia_cpufreq_unregister);
void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
struct pcmcia_low_level *ops, struct device *dev)
{
+ int i;
+
skt->ops = ops;
skt->socket.owner = ops->owner;
skt->socket.dev.parent = dev;
skt->socket.pci_irq = NO_IRQ;
+
+ for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+ skt->stat[i].gpio = -EINVAL;
}
EXPORT_SYMBOL(soc_pcmcia_init_one);
@@ -652,8 +765,9 @@ void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt)
pcmcia_unregister_socket(&skt->socket);
- skt->ops->hw_shutdown(skt);
+ soc_pcmcia_hw_shutdown(skt);
+ /* should not be required; violates some lowlevel drivers */
soc_common_pcmcia_config_skt(skt, &dead_socket);
list_del(&skt->node);
@@ -710,7 +824,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
*/
skt->ops->set_timing(skt);
- ret = skt->ops->hw_init(skt);
+ ret = soc_pcmcia_hw_init(skt);
if (ret)
goto out_err_6;
@@ -743,7 +857,7 @@ int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
pcmcia_unregister_socket(&skt->socket);
out_err_7:
- skt->ops->hw_shutdown(skt);
+ soc_pcmcia_hw_shutdown(skt);
out_err_6:
list_del(&skt->node);
mutex_unlock(&soc_pcmcia_sockets_lock);
diff --git a/drivers/pcmcia/soc_common.h b/drivers/pcmcia/soc_common.h
index 3ff7ead..ebdfa6c 100644
--- a/drivers/pcmcia/soc_common.h
+++ b/drivers/pcmcia/soc_common.h
@@ -50,6 +50,16 @@ struct soc_pcmcia_socket {
struct resource res_attr;
void __iomem *virt_io;
+ struct {
+ int gpio;
+ unsigned int irq;
+ const char *name;
+ } stat[4];
+#define SOC_STAT_CD 0 /* Card detect */
+#define SOC_STAT_BVD1 1 /* BATDEAD / IOSTSCHG */
+#define SOC_STAT_BVD2 2 /* BATWARN / IOSPKR */
+#define SOC_STAT_RDY 3 /* Ready / Interrupt */
+
unsigned int irq_state;
struct timer_list poll_timer;
--
1.7.4.4
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